Re: Linux 2.6.29

[Alan Cox]

On Fri, 27 Mar 2009 16:38:35 -0400
Jeff Garzik <jeff@xxxxxxxxxx> wrote:

> Christoph Hellwig wrote:
> > And please add a tuneable for the flush.  Preferable a generic one at
> > the block device layer instead of the current mess where every
> > filesystem has a slightly different option for barrier usage.
> 
> At the very least, IMO the block layer should be able to notice when 
> barriers need not be translated into cache flushes.  Most notably when 
> wb cache is disabled on the drive, something easy to auto-detect, but 
> probably a manual switch also, for people with enterprise battery-backed 
> storage and such.

The storage drivers for those cases already generally know this and treat
cache flush requests as "has hit nvram", even the non enterprise ones.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/